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Human fetal ileum cells show active transport by 112 days of gestation. Histological changes indicate absorption of glucose and amniotic fluid, alongside mucus secretion.
Area of Science:
- Gastroenterology
- Developmental Biology
- Histology
Background:
- The human fetal ileum undergoes significant histological development during gestation.
- Understanding the functional maturation of the ileum is crucial for fetal development research.
Purpose of the Study:
- To investigate the histological changes in the human fetal ileum related to cellular transport and secretion.
- To determine the stage of gestation at which key absorptive and secretory functions mature.
Main Methods:
- Histological examination of human fetal ileum tissue samples.
- Staining for glycogen and alkaline phosphatase to assess cellular activity.
Main Results:
- From 112 days of gestation, fetal ileum epithelial cells exhibit features of active transport, including vacuolation, a striate border, and proximity to blood vessels.
- Alkaline phosphatase and glycogen become prominent in these cells around 112 days.
- These findings suggest the ileum is capable of absorbing glucose and amniotic fluid, and secreting mucus by this developmental stage.
Conclusions:
- The human fetal ileum demonstrates mature absorptive and secretory functions by 112 days of gestation.
- Histological markers like glycogen and alkaline phosphatase are indicative of active nutrient and fluid transport in the developing ileum.
Abstract:
Normal histology, glycogen and alkaline phosphatase have been studied in the mucosa of human fetal ileum between 28 and 140 days of gestation. From 112 days onwards, the perinuclear, supranuclear and infranuclear vacuolation, striate border, and basement membrane of the columnar epithelial cells of the villi, and the very close proximity of the latter to blood vessels, all support the idea that the cells are actively engaged in transport of materials. Alkaline phosphatase and glycogen become conspicuous in the cells at this stage. It is argued that by 112 days the epithelial cells of the ileum are absorbing glucose amniotic fluid as well as secreting mucus.